The transient flow in a centrifugal pump during the discharge valve rapid opening process

Wu, Dazhuan; Wu, Peng; Li, Zhifeng; Wang, Leqin

doi:10.1016/j.nucengdes.2010.08.024

Cited by 49 publications

(22 citation statements)

References 15 publications

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“…For a low specific-speed prototype centrifugal pump with a closed impeller and an open impeller, respectively, Zhang et al tested the external performance of the pump model during rapid starting periods through experiments and analyzed the variation of the nondimensional head and the nondimensional flow rate with time [5,6]. Wu et al studied the transient flow characteristics of a centrifugal pump when the discharge valve is rapidly opened by numerical simulation and experimental test [7]. Liu et al numerically studied the stopping characteristics of a radial vane pump, wherein the volume of fluid (VOF) model was used to better simulate the interaction between water and air in the tank [8].…”

Section: Introductionmentioning

confidence: 99%

Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Zhang

Xiao

et al. 2014

Advances in Mechanical Engineering

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The transient performance of centrifugal pumps during the startup period has drawn more and more attention in recent years due to urgent engineering needs. In order to make certain the transient startup characteristics of a high specific-speed prototype centrifugal pump delivering the gas-liquid two-phase flow, the transient flows inside the pump are numerically simulated during the startup period using the dynamic slip region method in this paper. The results show that the difference in heads mainly focuses on the later stage of the startup period when the pump is used to transmit the pure water and the gas-liquid two-phase flow, respectively. The existence of the gas phase makes the head less than that of delivering pure water. The nondimensional head coefficient is very high at the very beginning of the startup period and then quickly drops to a stable value. The continuous variation of the attack angle at the leading edges of blades is the main reason for evolution of the internal flow field during the startup period.

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Section: Introductionmentioning

confidence: 99%

Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Zhang

Xiao

et al. 2014

Advances in Mechanical Engineering

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“…Liu et al [6] used DM method to simulate the stopping transient process. And Wu et al [9] used it to simulate transient process during the rapid opening period of the discharge valve in the pump system. In their studies, the motion of the impeller was prescribed.…”

Section: Mathematicalmentioning

confidence: 99%

“…CFD technology had been successfully used in the transient calculation of pumps during starting and stopping periods [6][7][8][9]. With this method, not only the external characteristic but also the internal flow field could be obtained clearly.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Transient Process of Power Failure in a Mixed Pump

Liu

Wang

2013

Advances in Mechanical Engineering

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A hydraulic-force coupling method was used to simulate the transient process of power failure condition. Computational fluid dynamics (CFD) was used to study the three-dimensional (3D), unsteady, incompressible viscous flows in a mixed flow pump in power failure accident. The dynamic mesh (DM) method with nonconformal grid boundaries was applied to simulate the variation of rotational speed of the field around the impeller. User-defined function (UDF) was used to obtain the rotational speed by solving the momentum conservation equation. External characteristics, such as rotational speed, head, flow rate, and hydraulic torque, were obtained during the transient process. Numerical speed and flow rate were compared with results calculated by semiempirical equation and they were in good agreement. The differences between transient and quasisteady results were also studied. Transient head and quasisteady head did not differ too much. The reason that caused this deviation was theoretically analyzed. The difference was explained to be caused by the inertia effect of the fluid contained in the pump and the pipeline. Internal flow field was also shown. Relative velocity vectors showed that the stall form and existence time in transient simulation were different from those in the quasisteady simulation. It is suspected to be one reason for head deviation.

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“…The combined valves have both suction and discharge functions which intensify CONTACT Yi Ma myant@zjut.edu.cn gas-liquid two-phase collection and pressurization. As the pivotal hydraulic component, the combined valves are directly related to instantaneous two-phase migration flow and discharge stability in internal-compressed multiphase pump (Wu, Wu, Li, & Wang, 2010). Hence, it is essential to study the working mechanism of combined valves to achieve the reliable operation of the multiphase pump and efficient recovery of oilfield associated gas.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of dynamic characterics for combined valves in multiphase pump

Luo

Zhang

et al. 2017

Engineering Applications of Computational Fluid Mechanics

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This research presents theoretical analysis and numerical simulation of combined valves' dynamic characteristics in reciprocating oil-gas multiphase pump. Based on the mathematical model describing valves' motion, a geometric model of pump cavity and combined valves is put forward for numerical simulation in multiphase pump. The simulation is conducted by computational fluid dynamics (CFD) method with its dynamic grid technique. The motion process of suction valve and discharge valve are obtained on the basis of boundary conditions and optimized numerical approaches. And the effects of gas volume fraction (0.1 ∼ 0.9), suction pressure (0.20 ∼ 0.40 MPa) and discharge pressure (1.0 ∼ 3.0 MPa) on valves' motion are reported. The results of pressure distribution, and valves' lift and velocity show that valve plates may cling or rebound and then vibrate after reaching the lift limiter, and the lag angle of one cycle remains 3°under different working conditions. The study could lay theoretical foundation for the design of new type of multiphase pump. ARTICLE HISTORY

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The transient flow in a centrifugal pump during the discharge valve rapid opening process

Cited by 49 publications

References 15 publications

Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow

Numerical Simulation of the Transient Process of Power Failure in a Mixed Pump

Numerical modeling of dynamic characterics for combined valves in multiphase pump

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